linux-kernel - [PATCH AUTOSEL 4.19 107/206] xfs: mark dir corrupt when lookup-by-hash fails

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Date:   Thu, 17 Sep 2020 22:06:23 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "Darrick J. Wong" <darrick.wong@...cle.com>,
        Dave Chinner <dchinner@...hat.com>,
        Sasha Levin <sashal@...nel.org>, xfs@....sgi.com
Subject: [PATCH AUTOSEL 4.19 107/206] xfs: mark dir corrupt when lookup-by-hash fails

From: "Darrick J. Wong" <darrick.wong@...cle.com>

[ Upstream commit 2e107cf869eecc770e3f630060bb4e5f547d0fd8 ]

In xchk_dir_actor, we attempt to validate the directory hash structures
by performing a directory entry lookup by (hashed) name.  If the lookup
returns ENOENT, that means that the hash information is corrupt.  The
_process_error functions don't catch this, so we have to add that
explicitly.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
Reviewed-by: Dave Chinner <dchinner@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/xfs/scrub/dir.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/xfs/scrub/dir.c b/fs/xfs/scrub/dir.c
index cd3e4d768a18c..33dfcba72c7a0 100644
--- a/fs/xfs/scrub/dir.c
+++ b/fs/xfs/scrub/dir.c
@@ -156,6 +156,9 @@ xchk_dir_actor(
 	xname.type = XFS_DIR3_FT_UNKNOWN;
 
 	error = xfs_dir_lookup(sdc->sc->tp, ip, &xname, &lookup_ino, NULL);
+	/* ENOENT means the hash lookup failed and the dir is corrupt */
+	if (error == -ENOENT)
+		error = -EFSCORRUPTED;
 	if (!xchk_fblock_process_error(sdc->sc, XFS_DATA_FORK, offset,
 			&error))
 		goto out;
-- 
2.25.1